SCIENCE 



Sixth Year. 

 Vol. XI. No. 257. 



NEW YORK, JANUARY 6, i5 



Single Copies, 

 ^3.50 Per Year, in 



Copyright, 1888, by THE SOIENOE OOMPANT. Bntersd 



Editorial ...... i 



Manual-Training Symposium in the Century, 



Ferdinand Vandeveer Hayden . ' . i 



Scarlet-Fever Report. — II. . .2 



Do Forests influence Rainfall ? Henry Gannett 3 

 The Germ Theory as a Subject of Education 



H. W. Conn 5 



American Society of Naturalists . . 6 



Exploration and Travel. 



Dr. H. Meyer's Ascent of the Kilima Ndjaro . . 8 



at New York Post-Office as Second-Olass Mail-Matter. 



Notes and News .8 



Letters to the Editor. 



The Flight of Birds _/. S. Newberry ; IV. P. Trowbridge g 



Eskimo and the Indian . . /. iV. B. Hewitt ii 



The Study of Languages .... W. 12 



Conspiracy of Silence . . Richard H, Buei 12 



Color and Other Associations . Edward S. Holdeii 1 2 



Thomas Braidwood and the Deaf-Mutes 



Thomas W. Braidwocd I2- 



The Science Company, Pfcbliskers, ^7 Lafayetfe Place, New Yoj^k, 



London agent: G. E. Stechert, 26 King Willicvui St., Strand. 



IMPORTANT .hTEXT-BOOKS 



IN MENTAL AN 



PSYCHOLOGY. 



By James McCosh, D.D., LL.D., President of Princeton College. 

 I. — The Cognitive Powers. II. — The Motive Povcers, 2 vols., 

 I2mo, each $1.50. 

 The first volume contains an analysis of the operations of the senses, 

 and of their relation to the intellectual processes, and devotes consider- 

 able space to a discussion of Sense-perception, from the physiological 

 side, accompanied by appropriate cuts. The second volume continues 

 the subject with a discussion of the power of the Conscience, Emotions, 

 and Will. 



Professor William De W. Hyde, of Bowdoin College. — "This Book 

 is written in a clear and simple style ; it breathes a sweet and winning 

 spirit ; and it is inspired by a noble purpose. In these respects it is a 

 model of what a text-book should be.'' 



ELEMENTS OF PHYSIOLOGICAL PSYCHOLOGY. 

 By George T. Ladd, D.D., Professor of Mental and Moral Philosophy 

 in Yale University. With Numerous Illustrations. 8vo, $4.50. 

 Prof. William James, in The Nation. — '' His erudition and his 

 broad-mindedness are on a par with each other ; and his volume will 

 probably for many years to come, be the standard work of reference on 

 the subject." 



AN OUTLINE STUDY OF MAN. 

 OR, THE BODY AND MIND IN ONE SYSTEM. By Mark 

 Hopkins, D.D., LL.D., Late President of Williams College. 

 With Illustrative diagrams. Revised Edition. i2mo, $1.75. 

 This work is on an entirely new plan. It presents man in his unity, 

 and his several faculties and their relations are so presented to the eye 

 in illustrative diagrams as to be readily apprehended. 



Gen. A. C. Armstrong, Principle of Hampton Institute. — " For over 

 ten years I have made it a text-book in the senior class of this school. 

 It is, I think, the greatest and most useful of the books of the greatest 

 of our American educators, and is destined to do a great work in form- 

 ing not only the ideas but the character of youth everywhere." 





*** Correspondence a7ld application f 07 



ation copies of the 



-r 



< 



"L SCIENCE. 



'S OF INTELLECTUAL SCIENCE. 



A Manual . ^ S'n ols and Colleges. By Noah Porter, D.D., LL.D. 

 8vo, $3.00:- 

 This is an abridgement of the author s " Human Intellect," contain- 

 ing all the matter necessary for use in the class-room, and has been in- 

 troduced as a te.xt-book in Yale, Dartmouth, Bowdoin, Oberlin, Bates, 

 Hamilton, Vassar, and Smith Colleges ; Wesleyan, Ohio, Lehigh, and 

 Wooster Universities, and many other colleges, academies, normal, and 

 high schools. 



ELEMENTS OF MORAL SCIENCE. 



THEORETICAL AND PRACTICAL. By Noah Porter, D.D., 

 LL.D. 8vo, $3.00. 



This treatise is intended primarily for the use of college and university 

 students, and is prepared with especial reference to the class-room. 



George S. Morris, Univ. of Michigan. — " I have read the work 

 with great interest, and parts of it with enthusiasm. It is a vast inprove- 

 ment on any of the current text-books of Ethics." 



Julius H. Seelye, President Amherst College. — " Like all the writ- 

 ings of its distinguished author it is copious and clear, with ample 

 scholarship and remarkable insight, and I am sure that all teachers of 

 Moral Science will find it a valuable aid in their instructions.'' 



THE LAW OF LOVE, AND LOVE AS A LAW. 



OR, CHRISTIAN ETHICS. By Mark Hopkins, D.D., LL.D., 

 Late President of Williams College. i2mo, $1.75. 

 This is designed to follow the author's '' Outline Study of Man." As 

 its title indicates, it is entirely an exposition of the cardinal precept of 

 Christian philosophy in harmony with nature and on the basis of reason. 

 Like the treatise on mental philosophy, it is adapted with unusual Skill 

 to educational uses. It appears in a new edition, which has been in 

 part rewritten in order to bring it into closer relation to his " Outline 

 Study of Man," of which work it is really a continuation. 



■eguestedfrom all teachers -wishing to select a text-book in mental or moral science. 



CHARLES SCRIBNER'S SONS, Publishers, 743 &-745 Broadway, New York. 



